Caption limits by platform
| Platform | Limit | Notes |
|---|---|---|
| TikTok caption | 2,200 | Counted in UTF-16 units by TikTok's Content Posting API |
| Instagram caption | 2,200 | Graph API: 30 hashtags, 20 @ tags; Instagram is moving to 5 hashtags |
| YouTube title | 100 | Per YouTube Help |
| YouTube description | 5,000 | Over 60 hashtags and YouTube ignores them all |
| X post | 280 | Links count 23; emoji and CJK characters count 2 |
| LinkedIn post | 3,000 | Per LinkedIn Help |
Checked on the pages listed under Sources on 28 October 2026. Platforms change limits; the app you post in has the final say.
How it counts
Characters are counted the way you see them: an emoji with a skin tone is one character. The TikTok bar counts UTF-16 units, as TikTok's API does, so some emoji count as two there. The X bar uses X's weighted count: every link is 23, emoji are 2.
Hashtags are counted wherever they appear in the caption. Duplicates are flagged, since repeating a tag adds length and nothing else.
Worked example
A 140-character caption with three hashtags and one emoji.
Instagram: 2,060 characters left. TikTok: 2,059, because the emoji is 2 UTF-16 units.
X: about 141 weighted characters (the emoji counts 2), 139 left.
Instagram hashtags: 3 of 5.
Sources
- TikTok for Developers, Content Posting API: Direct Post reference
- Meta for Developers, Instagram Graph API: IG User Media, caption limits
- Social Media Today, Instagram limits captions to five hashtags (Dec 2025)
- YouTube Help, Edit video settings (title and description limits)
- YouTube Help, Hashtag policies (over 60 hashtags are ignored)
- X Developer Platform, Counting characters
- LinkedIn Help, post character limit
Questions
What is the Instagram caption limit?
2,200 characters, per Meta's Instagram Graph API documentation. Hashtags, emoji, spaces and line breaks all count.
How many hashtags can I use on Instagram?
The Graph API documents 30, but in December 2025 Instagram said it would gradually limit captions to five hashtags per post or reel. Plan for five.
What is the TikTok caption limit?
TikTok's Content Posting API allows captions up to 2,200 UTF-16 units. The in-app limit can differ, so check the app if you're writing long captions.
How long can a YouTube title and description be?
100 characters for the title and 5,000 for the description, per YouTube Help.
How many characters is an X post?
280, weighted: links count as 23 and each emoji as 2, per X's developer docs.
Is my caption saved?
No. It's counted in your browser and never sent anywhere.